<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>study</title>
    <script src="js/jquery-3.3.1.min.js"></script>
    <script>
        $(function () {
            $("#b1").click(function () {
                alert("abc");
            });
        })
    </script>
</head>
<body>
<div id="div1">div1....</div>
<br>
<div id="div2">div2....</div>
<br>
<input id="b1" type="button" value="点一下??">


</body>
</html>